1 probably stupid question but HOE stand for hardcore? thanks
No, it stands for "Hell-on_Earth", which is the most difficult (as you guessed, "hardcore") mode available in KF.
Several 1ups, acting as a team, spent many months completing each of the levels, but some of the achievements are not available until the next major KF update. I am looking forward to it. The game is very exciting and I would recommend it to anyone who wants a really good, high quality zombie shooter. During special sale events you can purchase the game for about $5, instead of the normal $19.99 price.